Improvement in knob attachments



A. DIGKERMAN. Knob. Attachment.

No. 205,061. Pate nted lune 18, I878.

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AMOS DICKERMAN, OF NEW HAVEN, CONNECTICUT, ASSIGNOR TO MALLORY, WHEELER& 00., OF SAME PLACE.

IMPROVEMENT IN KNOB ATTACHMENTS.

Specification forming part of Letters Patent No. 205,061, dated June 18,1878; application filed May 25, 1878.

To all whom it may concern:

Be it known that I, AMOS DICKERMAN, of New Haven, in the county of NewHaven and State of Connecticut, have invented a new Improvement inSwiveled Door-Knobs; and I do hereby declare the following, when takentends through the door, and one of them is desired to be loose on thespindle, and so that the spindle cannot be turned by it and the otherknob fixed to the spindle, and so that by it the spindle can be turned.The common and best known method of doing this is to make a swiveledjoint in the spindle, both knobs being rigidly attached to its ownindependent part.

The object of this invention is to. simplify this construction; and itconsists in constructing the end of the spindle for the loose knobcylindrical, but with one or more annular grooves, and the neck of theknob with a cavity larger than said cylindrical portion, or so thatthere will be cavities around the cylindrical portion in the neck of theknob, and then filling the cavities with Babbitt or other suitablemetal, which will engage rigidly with the knob and with the annulargrooves in the cylindrical part of the spindle, so as to prevent theseparation of the two, and yet allow the knob to turn freely on thespindle.

A represents the spindle, which is of the usual angular form,andattaohed to the knob B in the usual manner, so that turning the knobwill turn the spindle. The other end of the spindle, and of a lengthcorresponding to the cavity in the neck of the knob C, is madecylindrical, as at a, and around the cylindrical portion one or moreannular grooves, b, are formed.

The cavity in the knob may be of the usual square form, and with anopening, (I, corresponding to the usual screw-hole. When the cylindricalportion is set into the neck of the knob, as seen in the figure, Babbittor other 7 metal is poured through the aperture (1 to fill the spacearound the cylindrical portion. The irregular form of the cavity in theneck prevents the filling from turning, and transverse depressions orirregularities, as d, prevent the filling from being drawn out. Thecylindrical form of the end of the spindle allows the knob to turnfreely thereon independent of the spindle, and the annular groove orirregularity secures the two together, and a most perfect working anddurable swiveled knob is produced.

I am aware that knobs have been swiveled to the spindle without thedivision of the spindle first referred to; but I am. not aware that thismethod of swiveling was before known or used.

I therefore claim as my invention- The combination of the spindle,constructed at one end of cylindrical form and with an annular groove orgrooves in said cylindrical portion, with a knob having a cavity in itsneck to receive the said cylindrical portionand a filling in said cavityto engage with both the neck of the knob and the groove in the spindle,substantially as described.

' AMOS DIOKERMAN.

Witnesses:

J. H. SHUMWAY, JOHN E. EARLE.

